Template fails at start, but works after an in developer tools

Configuration
1 
Error while processing template: Template("{% set a = 17.271 %} {% set b = 237.7 %} {% set taupunktTmp =(a * states('sensor.temperatur_garage')|float(none)) / (b + states('sensor.temperatur_garage')|float(none)) + log(states('sensor.feuchte_garage')|float(none)/100) %} {% set taupunkt = (b * taupunktTmp) / (a - taupunktTmp) %} {{ taupunkt|round(1) }}")

TemplateError('TypeError: unsupported operand type(s) for *: 'float' and 'NoneType'') while processing template 'Template("{% set a = 17.271 %} {% set b = 237.7 %} {% set taupunktTmp =(a * states('sensor.temperatur_garage')|float(none)) / (b + states('sensor.temperatur_garage')|float(none)) + log(states('sensor.feuchte_garage')|float(none)/100) %} {% set taupunkt = (b * taupunktTmp) / (a - taupunktTmp) %} {{ taupunkt|round(1) }}")' for attribute '_attr_native_value' in entity 'sensor.taupunkt_garage'

        {% set a = 17.271 %}
        {% set b = 237.7 %}
        {% set taupunktTmp =(a * states('sensor.temperatur_garage')|float(none)) / (b + states('sensor.temperatur_garage')|float(none)) + log(states('sensor.feuchte_garage')|float(none)/100) %}
        {% set taupunkt = (b * taupunktTmp) / (a - taupunktTmp) %}
        {{ taupunkt|round(1) }}

I just can’t finde the error in this script. It works in developer tools.

Could this be because the sensor is not instantly available at start (MQTT) or why do I get this error?
How can I avoid this?

2

Try setting numbers for your filter defaults instead of none and use an availability template to protect against incorrect values. Just like we discussed in the other topic.

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